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Heating(High Power) Appliances on Ligting Circuit

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Nigel Goodwin

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may i know the differneces b/w lighting circuit wire and heating circuit wires?
and how is power consumption of Heaters etc., so high? Do they have high resistances? P= IV = I(square)R >> Lower the resistance high is the current, hence the power???
Nothing that technical, just read the wattages off the product:

Average bulb: 60W

Electric Heater: 3000W

In the UK the lighting circuits are fed through a 5A fuse, and thinner wires, allowing a maximum of 1250W (roughly).
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